Multiple choice Which of the following is not used in standard procedure of Gram staining? Iodine Carbol fuchsin Acetone and Ethanol Fuchsin and safranin Crystal violet Reveal answer Fill a bubble to check yourself B Correct answer Explanation Carbol fuchsin is not included in gram staining. It stains species of Mycobacterium tuberculosis that do not stain with the standard laboratory staining procedures like Gram staining.